气象科学2024，Vol.44Issue(5)：881-889,9.DOI:10.12306/2023jms.0048
一次暴雨过程的锋生特征及风场演变分析
Analysis of frontogenesis characteristics and the winds field evolution of a rainstorm process
摘要
Abstract
By using ECMWF ERA-INTERIM(0.25°×0.25°)reanalysis data and FY-2H TBB data,through calculating the relationship between frontogenesis function,non-geostrophic wind,horizontal wind shear intensity distribution and rainstorm,the cause of a rainstorm process in Jiangsu on July 5-7,2020 was diagnosically analyzed.Results indicate that in areas of heavy precipitation,frontogenesis occurs in the middle and lower layers,and frontogenesis disappears in the middle and upper layers.The 850 hPa frontogenesis change can better reflect the impact on rainstorm.Divergence term and deformation term are positive contributions to frontogenesis.The deformation term and tilt term are basically consistent with the change trend of total frontogenesis.Divergence frontogenesis is always accompanied by the whole precipitation process.The strongest stage of rainstorm is the result of superposition of tilt frontogenesis on horizontal frontogenesis.Frontogenesis strengthens the non-geostrophic nature of the wind field and forces secondary circulation on the front,with the divergence of non-geostrophic winds forming an ascending branch of the secondary circulation.In the lower troposphere,the intensity of frontogenesis increases synchronously with the development of the jet stream.The meridional v field change of 200 hPa upper air jet is positively correlated with the evolution trend of rainstorm intensity:at the beginning of rainstorm,v field increases and precipitation increases;when the upper jet v field is the largest,the rainstorm is the strongest;at the end of rainstorm weakening,the high and low level v fields decrease,the north wind increases,and the secondary geostrophic phenomenon in the right rear of the upper level southwest jet disappears,turning into the super geostrophic southwest wind.关键词
暴雨/锋生/非地转风/急流/风场演变/次级环流Key words
rainstorm/frontogenesis/geostrophic wind/jet/wind field evolution/secondary circulation分类
天文与地球科学引用本文复制引用
赵凯,张银意,陈小宇,陈圣劼,王磊..一次暴雨过程的锋生特征及风场演变分析[J].气象科学,2024,44(5):881-889,9.基金项目
江苏省气象局重点资助项目(KZ202107) （KZ202107）
